The stock soared 5.53% to end at Rs 317.50 on BSE. During the day, it zoomed 6% to Rs 319.20.
At NSE, it jumped 5.91% to close at Rs 318.80.
The stock was the top gainer on both Sensex and Nifty during the day.
The company added Rs 6,656.45 crore to Rs 1,26,917.45 crore in its market valuation.
"Bharti Airtel International (Netherlands) BV through its wholly owned subsidiary has completed the acquisition of Econet Wireless Limited's entire 4.2% shareholding in Airtel Nigeria. As a result, Airtel's overall holding in Airtel Nigeria has increased to 83.25%," Airtel said in a statement on Saturday.
Though financial details of the deal were not disclosed, Econet had valued the stake at $3 billion.